Add the normal sphere

src/ol/sphere/normal.js

@@ -0,0 +1,10 @@
+goog.provide('ol.sphere.NORMAL');
+
+goog.require('ol.Sphere');
+
+
+/**
+ * The normal sphere.
+ * @const {ol.Sphere}
+ */
+ol.sphere.NORMAL = new ol.Sphere(6370997);